Strain meter



Much 16 1926.

lA. pxx

STRAIN METER amm.

A. DIX

March 16 1926.

STRAIN METER 'Filed June 6', 1925 2 Sheets-Sheet 2 Gemma* 'of' the United States; residing Vat Taft,.inlthe `county lcfg-Kern and Statek of AlCalifornia,

have?invented'certainfnew and useful Inlprovements in Strain Metersg'of, which' the vvisioiioff strain indicating means in com" .20"

following is a -speciiication, reference being had therein-to theaccompanyingy drawing. ,*The present inventionrelates to strain or Vdrilling meters, and aim'sto providea novel f Y andiinproved device'forfuse'on wellwdrilling rigs andladaptedllforfvconnection with the 'drillingcablelinaorderftol indicate at all times' f2 the 'drill' pipe, Avand also 'Aiiotherfofbjectvofthe 4inw'rention is the pro'- binatifonwith` novelji'neans for mounting .said nieans'and connecting same with the readily installed -`:on a `drilling rig and will efficien'tlyserve itsfpurposell-f f Y. f

f VVithf-ly the" 'foregoing Aand other 'objects in f 74V.parting from" the spiritof the invention.'

I The inventionrisillustrated-fin the accompanyingndrawings,wherein?- v 4Figurel` s ani-'elevation of fone forni of,`

strain Ineteras"installed on a, drilling rig;

Fig. 2 jisf afsectionf'onlthe line 2 2 of Y `meter as applied toa y A ."A'hydraulie pressure indicatorisused as `fss'howntreference being had to Figs. 1 andl 2i `Thus, a1vertical-- cylinder 7Y (preferably filled with oil)"'isfprovided in which v a plunger 8 reciprocates,c"and said plunger ll,projectsfroin the lower end of the cylinder and is Vprovided withv suitable packing means.V ,The upper end of the cylinderv'? .v yis screw-threadedor votherwise secured in a lheadlor cap Qlufhichseats` upwardly against ayoke 10that is 'fanchored'to thefbase or foundation offthel drillingrig, by means [of rods 10, 'The head 9 isv secured tothe i i jij-57165533? l s'TnIN METnR. d vAppii'eatiai Eamalgame s, `17925. seririfnvo. 35,4702.

yoke 10 means Voffa bolt 11.. engagingV througlrsaid head and-bearing `ona washery .Or plate. 12 seating on the `yoke 10. f

Y A pressure gage 13 is 'connected through:

a valve 114 ywiththecylinder 7 and the pointerv yof the gage. will indicate: in pounds y or other unit thea'lnount of strain*l on` thedrilling cable V15 with which theg plunger 8`is connected. vHoweveigit willbe appar-jy ent that other means may be used, as well known inthe art, for indicating the strain A the upward-movement "of the plungefrSl` 'i e i acting against a yieldablef resisting mediunn-` "'i j "lfn vorder to connect theV plunger 8 with@ the'f'drillingcable 15 a clampA 'is provided' includingv `'the 'jaws 16 between which the A'oablepasses', and a bandl 17 :surrounds's'aid flaws and carries a setjscr'e'w-lS which-may be tightened forjclamping the jaws on the' cable.k "The jaws` 16 `havefeyes v19 at their lower ends engaged byie'yes -orloops 20 onV thea-upper vends of links.or"rod`s"21 disposed at opposite'sides ofthe cylinder 'Zand passling jsl-idablythrough or across the `yoke 10; 'Ther lower ends of the ,linksv 21 have eyes sok or loops 22 einbfracing ak'tr'ansversepin '237:1 that V'extends through the lowerend portion of the plunger 8, and the linksv V2l are retained on the pin 23 by means of cotter `or other retaining elements 24. By attaching the device totheyoke device may bezpositioned inv front of or adjacenty to'thecalf wheel drum 26 onwhich the surplus drilling cable is woundKnot'shown),

VVitbeing understood that the cable 15 extends 10, the

from` the yjaws 16 of the cable clamp to and is wound upon the drum26 as usual.4 The of the drilling rig,l with the strain indicator *disposed between the 'cable clamp and yoke or member 10 which is rigidly connected with the base or frame ofthe rig, so that 8, so as ,to be'v indicated byy the gage 13.

- f Y Y 'deviceis used foranch'oring the dead linevr v l Fig. 3 isan-el'elvation of a modified con-v struction Aof :strain l"drillingrig l '.Figgis a-section..onfthe line 4 4 of Therefore, the kgage 13v`will indicate at all of' times the weight of 'the'drill' bit. The attendant may note from the gage 13, by a devoreasein the Weightindication', whena por- ,tionof a drill pipe` is twisted. oif, and, in fishing for a lost bit or tool, the gage will indicate when such bit Vor tool has been caught.

Figs. 3 and 4 illustrate 1a modilicz'ttion.V The cylinder 7 is disposed abovethe yoke 10 and'is connected thereto by means of a sleeve lndenWith the vyoke.

11" 1wllielyh'zisits uppe end screw-obre aded ''olfothelwvisev seeuied`v on the ylower v end? por'- "vti'onof VVthe eylinclefr,vk with seid sleeve eX-V ftending downwaidlyy from the cylinder.

The `sleeve V'has4 openings ',lZffieCeiving the' yokeA 10', whereby thefsleeve foonneots'theioyl-A Said yoke is anoliored 'i lo Che-baseer'foundation ofthe rig-gingby Y' VJdieY rods 10";v vlhe'pin 23 Which-engages" 10 fshrouglithe l'oWeFend pontionzof'the plunger 4 i 85 Worlgsfinl longitudinal jslots-25l Withwhioli l 1 V"die sleevel'lfis provided; betweenltfhefopenff.

ings: 12' andi eylilfld'ei"7"v i v llliejaws 16 oftheeablezelampaaie inte-V gra-l' Withi the 'lippen terminals, Qffbhe f rods onlinks ZLjandJae' offset over j@heV cylinder z Carries-1 the sebsoiews 18v for clamping: said jaws on the drilling;'cable15.y 'I-lie pressure Vfpen'end of theeylindeinl' 'lllie'lower-termi-Y l yoliefoi' bai' 10. byslidingfulie sleevefll/jyand eordinguitofbhegeliange 'imposition of the Alel'izo theaxis of thednum; '-'Haxzing thus de. Vscribed the invention, whatclaiinfledvf:isf`r 'dieatoi- -hailing' af oylinden :indy as: plunge Y drillngable @firme iig,V and.' meansacomieet 'igpossibie to 'Slide or Snif@ the device-perfil;

Y 'l v lwscfain"V mec'er compiising {strainfindieeting-V means v including'- 'af cylinder Tand fa plnn'ger Working in the'oylinder and projec17` 3 ving,r downwardly tliererom, means for oon-5 meeting said cylinder- With the frame or base of adiilling iig, a' ola-mp. above ther' Cylin derY `for engaging they*drilling);A Gable loffthe Wonking intheoyliniden and! projecting from tliewlowei end tlieieohmeans for connecting 't'lie'oyvlinder ,with the/freine or base off a ,f

d nl ling rig; Cable ellam'pgabove the cylindje linksaf, oppositesidesV of .eyli ndenv co the 4lon'en ,endchereof;v afyokeyifods connecte fname ory baise" offra,V drilling rig, fmeansseouy ing saidffeylinden to safidyoke, A a, oableg clamp. 

